This level of dominance over other players is actually quite unprecedented; what do you mean by "How much further will he slip?" ? Giving three examples of important, high-level tournaments where he earned first place and one where he got second hardly helps your argument. Also, his 8th place result is what most people would call an 'outlier'.
Magnus Carlsen's horrible 2015
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I think maybe "sarcasm" ?
1st in Tata Steel
1st in Baden-Baden
1st in Shamkir
8th in Norway
2nd in St. Louis
How much further will he slip?